BÜYÜK İSTANBUL TÜNELİ (Great İstanbul Tunnel)
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This is world's 1st 3 storied tunnel.... 1st and 3rd floors are for automobiles and 2nd(mid floor) is for metro.... This project's tunnels are much longer but 3 storied part of the tunnel is 6,5 km long... Project will be done with build-operate-transfer type... State will pay nothing for the project... Estimated project cost is $3,5 bln... Better watch the video... It's in Turkish but you can understand the main issue....
Video is in 1080p
Details... Article is in Turkish..
I don't know but i can't give direct link from this website of Ministry...
But here it is
T.C. Ulaştırma, Denizcilik ve Haberleşme Bakanlığı
@Hakan dude can you add...